diff --git a/ncdu_s3/directory_walker.py b/ncdu_s3/directory_walker.py
index e9ae205..0d35697 100644
--- a/ncdu_s3/directory_walker.py
+++ b/ncdu_s3/directory_walker.py
@@ -12,7 +12,7 @@ def __init__(self, writer):
         self.writer = writer
         self.current_path = []
 
-    def process_item(self, path, size):
+    def process_item(self, path, size, last_modified):
         key_filename = path.pop()
 
         if self.current_path != path:
@@ -41,4 +41,4 @@ def process_item(self, path, size):
         # directory entry ends with a '/' so the key_filename will be ''.
         # in that case, omit it
         if key_filename != '':
-            self.writer.file_entry(key_filename, size)
+            self.writer.file_entry(key_filename, size, last_modified)
diff --git a/ncdu_s3/main.py b/ncdu_s3/main.py
index 0adaa52..9fbe908 100755
--- a/ncdu_s3/main.py
+++ b/ncdu_s3/main.py
@@ -21,8 +21,8 @@ def main(ctx, s3_url, output):
     with NcduDataWriter(output, s3_url) as ncdu:
         walker = DirectoryWalker(ncdu)
 
-        for path, size in s3_directory_generator:
-            walker.process_item(path, size)
+        for path, size, last_modified in s3_directory_generator:
+            walker.process_item(path, size, last_modified)
 
 if __name__ == '__main__':
     main()
diff --git a/ncdu_s3/ncdu_data_writer.py b/ncdu_s3/ncdu_data_writer.py
index f62f9c1..6489a06 100644
--- a/ncdu_s3/ncdu_data_writer.py
+++ b/ncdu_s3/ncdu_data_writer.py
@@ -51,15 +51,17 @@ def dir_leave(self):
             self.depth -= 1
             self.output.write(']')
 
-    def file_entry(self, name, size):
+    def file_entry(self, name, size, last_modified):
         """
         :type name: str
         :type size: int
+        :type last_modified: datetime
         """
 
         self.output.write(",\n")
 
-        json.dump({'name': name, 'dsize': size}, self.output)
+        unixtime = int(time.mktime(last_modified.timetuple()))
+        json.dump({'name': name, 'dsize': size, 'mtime': unixtime}, self.output)
 
     def close(self):
         for i in xrange(self.depth):
diff --git a/ncdu_s3/s3_directory_generator.py b/ncdu_s3/s3_directory_generator.py
index 1a3a04c..1ba812d 100644
--- a/ncdu_s3/s3_directory_generator.py
+++ b/ncdu_s3/s3_directory_generator.py
@@ -1,11 +1,11 @@
 from __future__ import absolute_import
 
-import urlparse
+from urlparse import urlparse
 import boto3
 
 class S3DirectoryGenerator(object):
     def __init__(self, s3_url):
-        parsed_s3_url = urlparse.urlparse(s3_url)
+        parsed_s3_url = urlparse(s3_url)
         if parsed_s3_url.scheme != 's3':
             raise SyntaxError('Invalid S3 scheme')
 
@@ -43,4 +43,4 @@ def generator(self):
                 # we assume the S3 prefix is a directory that wasn't terminated with a '/'
                 path.pop(0)
 
-            yield (path, o.size)
+            yield (path, o.size, o.last_modified)